@@ -251,6 +251,9 @@ Use UDP multicast as lower transport protocol.

 @item http

 Use HTTP tunneling as lower transport protocol, which is useful for

 passing proxies.

+

+@item filter_src

+Accept packets only from negotiated peer address and port.

 @end table

 Multiple lower transport protocols may be specified, in that case they are

@@ -1186,16 +1186,18 @@ static int make_setup_request(AVFormatContext *s, const char *host, int port,

             break;

         case RTSP_LOWER_TRANSPORT_UDP: {

-            char url[1024];

+            char url[1024], options[30] = "";

+            if (rt->filter_source)

+                av_strlcpy(options, "?connect=1", sizeof(options));

             /* Use source address if specified */

             if (reply->transports[0].source[0]) {

                 ff_url_join(url, sizeof(url), "rtp", NULL,

                             reply->transports[0].source,

-                            reply->transports[0].server_port_min, NULL);

+                            reply->transports[0].server_port_min, options);

             } else {

                 ff_url_join(url, sizeof(url), "rtp", NULL, host,

-                            reply->transports[0].server_port_min, NULL);

+                            reply->transports[0].server_port_min, options);

             }

             if (!(rt->server_type == RTSP_SERVER_WMS && i > 1) &&

                 rtp_set_remote_url(rtsp_st->rtp_handle, url) < 0) {

@@ -1315,6 +1317,8 @@ redirect:

             } else if(!strcmp(option, "http")) {

                 lower_transport_mask |= (1<< RTSP_LOWER_TRANSPORT_TCP);

                 rt->control_transport = RTSP_MODE_TUNNEL;

+            } else if (!strcmp(option, "filter_src")) {

+                rt->filter_source = 1;

             } else {

                 /* Write options back into the buffer, using memmove instead

                  * of strcpy since the strings may overlap. */

@@ -309,6 +309,10 @@ typedef struct RTSPState {

     /** Reusable buffer for receiving packets */

     uint8_t* recvbuf;

+

+    /** Filter incoming UDP packets - receive packets only from the right

+     * source address and port. */

+    int filter_source;

 } RTSPState;

 /**